Expert: Dan Griffin - 5/23/2008

Question
Greeting from warm and wet La.  Have added 22x32 den/sun room with 1/2 cathedral ceiling.  How to figure,cut and install 3-1/2" crown molding where the sloped ceiling meets the horizontal wall.  Ceiling rise is 4 deg.  I think I need a pie shaped transition piece in the corner but don't know how to figure both angles, I know they will be different on both sides.  Please give me some simple way of making molding meet in this corner.  Thank you   Bill

Answer
Bill, hope you enjoy your new sun room.  You have a couple of choices.  I like using a plinth type block in the corner and let each molding die into the block.  I've not found it to be objectionable, although the piece going up hill will be a longer cut than the horizontal.  It is fast and easy.

The other choice is to make the pie shaped piece.  Here is site that has already worked out the bugs and has good advice:
http://www.compoundmiter.com/cathedral_ceiling.html

Hope this gives you what you need, trying to explain it with text only would be rough.